Headphones history and review:
https://drop.com/buy/massdrop-x-hifiman-he-350

  •  HiFiMAN + Massdrop
  • Driver: 50 mm dynamic
  • Impedance: 19 ohm
  • Sensitivity: 93 dB at 1 mW
  • Frequency response: 20 Hz – 20 kHz
  • Velour ear pads
  • Detachable cable
  • Cable length: 53 in (135 cm)
  • Cup connectors: 0.1 in (2.5 mm)
  • Plug: ⅛ in (3.5 mm)
  • Weight, with cable: 12.1 oz (343 g)
  • Weight, without cable: 10.6 oz (301 g)